Ophthalmic lenses, dioptric formulae for combined cylindrical lenses : the prism-dioptry, and other optical papers (1900)
Prentice, Charles Frederick, b. 1854 · Philadelphia : Keystone · leaf 95
ncipal planes. By the equations (54) and (55), calculation may be greatly simplified.R^ being determined for a specific value of /, we may readily determine R^and R^^ by transforming these equations, as follows : R, = r,^r.-R,— ^0= fl — « — ^r This is demonstrated in the appended tables, although… … Fig. 1 .i.....L..l • :■. f f■:; p — J dJ \ CHAS. F. PRENTICE COPYRIQHT. 1888 IV. SPHERO-CYLINDRICAL EQUIVALENCE. Since, for any combination of cylinders, the principal planes of refrac-tion are at right angles to each other for all values of ^, there can be noreasonable doubt, owing to the…
Lenses
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